I'm thinking that the centreboards that came with Twice Shy were not the original ones. Back in them days the old mozzies had wide boards.
Check where the cases are positioned relative to the rules. I'm guessing that they are well forward and probably vertical relative to the deck.
If thats the case then you could angle the boards back by putting fibreglassed wedged foam blocks into the case and angle them according to the rule limits. It's a quick fix and may improve the old girls handling.
